Crystal Structures and Magnetic Studies of Naphthalene Derivatives Containing Nitronyl Nitroxides

Crystal structures of new nitronyl nitroxide derivatives 1, 2 and 3 were determined with X‐ray diffraction analysis: 1, monoclinic, C 2 /c, a = 1.2404(5) nm, b = 0.9730(5) um, c = 2.7049(10) ran, β = 98.189(15)°, V = 3.2315(24) nm 3 , Z = 8; 2, or‐thorhombic, Pbca, a = 0.61262(2) nm, b = 1.11426(6) nm, c = 2.30543(13) nm, V = 1.57373(13) nm 3 , Z = 4; 3, monoclinic, P 2(1)/ n, a =0.64253(4) nm, b =2.55003(17) nm, c = 1.15497(6) nm, β = 95.000(3)°, V = 1.8852(2) nm 3 , Z = 4. Their magnetic properties were measured with SQUID and analyzed based on their crystal structures with simple singlet‐triplet, modified one dimensional antiferromagnetic chain and modified singlet‐triplet models respectively: 1, J/k b = −2.5 K; 2, J/k b = 7.8 K, θ = 2.8 K; 3, J/k b = −0.96 K, θ = 0.21 K.